I think it is stupid that the Cyclops submarine will still burn in the absence of oxygen. And, no weapons isn't a "stupid feature", at least that is what I say whenever something has lore. You can't make weapons because they were removed from the standard survival blueprints following the massacre on Obraxis Prime. You may argue that the Modification Station is not a standard survival fabricator, but remember, your PDA did an oopsie and deleted 80% of your blueprints and you are never able to scan fragments of guns, minus the Propulsion Cannon and Stasis Rifle. Also, the Repulsion/Propulsion Cannons are kind of guns, let's be honest. Ever tried shooting lead with a Propulsion Cannon?